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Yeah whales and dolphins are in the "maybe" group, and at the very least they're smart enough to know that what they're doing will kill them. But nobody really knows why whales do this. It might not be a deliberate attempt to die, they could just be exhausted or confused. There's no real way of knowing the motivation, which of course is why it's so difficult to prove animal suicide.
In some cases disease plays a role. I don't think self-euthanasia counts as suicide in this context, at least not for the purpose of this conversation. Disease can make animals behave erratically, and if they know their disease puts their colony at risk, then it doesn't seem so strange. It's when animals are depressed or injured and they make a conscious decision to end their life, that's just not something you think an animal is capable of.
Whales and dolphins, these are the pretty much the most intelligent animals after humans, it wouldn't surprise me to discover they are capable of conscious suicide. Certainly I think they are capable of being depressed, or aware they are going to die a horrible death and so choose a less horrid method. There's not many animals I'd expect to have this degree of intelligence and emotional awareness though, maybe elephants and some dogs, maybe cats, the list is small though. I wouldn't have put crows on that list until recently, and if crows make the list, you can probably add magpies, rooks, ravens and jackdaws.
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